To be fair it wasnt the brightest idea to attempt to sail round the world as an "inexperienced sailor" but then I guess that's why he was window cleaner.
Its a sad story but something just doesn't add up.
MSN reports;
The 42-year-old “inexperienced sailor”, from South Shields, Tyne and Wear, travelled across the Atlantic to the Caribbean and was
last seen alive as he left the island of Grenada on 6 December.
A fellow sailor from Manchester, who met him on the Caribbean island, alerted the International Boat Watch Network (IBWN) to his missing boat after growing concerned about him.
Mr Brennan’s yacht had dirty fuel, no radio or mobile network and had lost its dinghy while crossing the Atlantic, claimed Boat Watch, which described him as a “somewhat inexperienced sailor”.
A search and rescue team spotted the vessel
adrift with its sails furled, or rolled up, and no signs of life on board on three occasions between 19 and 21 December, the organisation said.
This must have been a planned short sail as he hadn't unfurled the sails. Engine failed due to dirty fuel. Unfortunately they don't often release the course of death after an autopsy.
A number of solo sailors have died at sea. There was a boat towed into Granada a number of years ago with deceased German sailor aboard;
https://www.youtube.com/watch?v=IT7-cBmCUvEhttps://www.nowgrenada.com/2017/04/german-national-found-deceased-drifting-yacht/There was also a similar situation in Indonesia a few years ago.